简介：ThedosimetricphosphorsLi_3PO_4:M(M=Tb,Cu)wereproducedbymodifiedsolid-statemethod.ThestructuralandmorphologicalcharacterizationwascarriedoutthroughX-raydiffraction(XRD)andscanningelectronmicroscope(SEM).Additionally,thephotoluminescence(PL),thermoluminescence(TL)andopticallystimulatedluminescence(OSL)propertiesofpowderLi_3PO_4dopedwithTbandCuwerestudied.ItisadvocatedthatLi_3PO_4:CuphosphornotonlyshowshigherOSLsensitivity(25timesormore)butalsogivesfasterdecayinOSLsignalsthanthatofLi_3PO_4:Tb~(3+)phosphor.Theminimumdetectabledose(MDD)ofLi_3PO_4:M(M=Tb,Cu)phosphorsisfoundtobe21.69×10~(-3)and3.33×10~(-6)J·kg~(-1),respectively.InOSLmode,phosphorshowslineardoseresponseintherangeof0.02-20.00J·kg~(-1).InTLmode,sensitivityofLi_3PO_4:CuphosphorismorethanthatofLi_3PO_4:Tbphosphor.Thekineticsparameterssuchasactivationenergyandfrequencyfactorsweredeterminedbypeakshapemethod,andphotoionizationcrosssectionsofpreparedphosphorwerecalculated.

简介：LayeredcathodematerialLiCo1/3Ni1/3Mn1/3O2wassynthesizedbyPechiniprocess,andinvestigatedusingX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andgalvanostaticcharge/dischargecycling.Thesampleiswell-crystallizedandhasaphase-purea-NaFeO2structure.Theparticlesizesareuniform,anddistributedintherangeof20-200nm.TheinitialdischargecapacityoftheLi/LiCo1/3Ni1/3Mn1/3O2cellwasabout149mAh·g-1whenitwascycledatavoltagerangeof4.5-2.3Vwithaspecificcurrentof0.25mA.Theresultisbetterincomparisonwithsolid-statesolutionmethod.Thesyntheticprocedurewasdiscussed.Threemajorreactions:chelation,esterification,andpolymerizationsuccessivelyoccurred.

简介：EmployingLi2CO3,NiO,Co3O4,andMnCO3powdersasstartingmaterials,Li[Ni1/3Co1/3Mn1/3]O2wassynthesizedbysolid-statereactionmethod.Variousgrindingaidswereappliedduringmillinginordertooptimizethesynthesisprocess.Aftersuccessiveheattreatmentsat650and950℃,thepreparedpowderswerecharacterizedbyX-raydiffraction(XRD)analysis,scanningelectronmicroscopy,andtransmissionelectronmicroscopy.Thepowderspreparedbyaddingsalt(NaCl)asgrindingaidexhibitaclearR3mlayerstructure.ThepowdersbyothergrindingaidslikeheptaneshowsomeimpuritypeaksintheXRDpattern.Theformerpowdersshowauniformparticlesizedistributionoflessthan1μmaveragesizewhilethelattershowsawidedistributionrangingfrom1to10μm.EnergydispersiveX-ray(EDX)analysissshowthattheratioofNi,Co,andMncontentinthepowderisapproximately1/3,1/3,and1/3,respecively.TheEDXdataindicatenoincorporationofsodiumorchlorineintothepowders.Charge-dischargetestsgaveaninitialdischargecapacityof160mAh·g-1forthepowderswithNaCladditionwhile70mAh·g-1forthepowderswithheptane.

简介：本文介绍了低温(-50℃)乙烯球罐制造和焊接技术,制定了球罐制造工艺流程和球壳板成形工艺,通过试验确定了焊接预热温度、层间温度和后热温度,并正确选择了焊接材料。制定了乙烯球罐的焊接工艺规范,并成功地完成了低温(-50℃)乙烯球罐的制造和焊接。

简介：InordertoimprovetheelectrochemicalcyclestabilityofLa-Mg-Nisystem(PuNi3-type)hydrogenstoragealloy,NiinthealloyswaspartiallysubstitutedbyM(M=Cu,Al,Mn).AnewLa-Mg-NisystemelectrodealloysLa0.7Mg0.3Ni2.55-xCo0.45Mx(M=Cu,Al,Mn;x=0,0.1)werepreparedbycastingandrapidquenching.Theeffectsofelementsubstitutionandrapidquenchingonthemicrostructuresandelectrochemicalperformancesofthealloyswereinvestigated.TheresultsbyXRD,SEMandTEMshowthatthealloyshaveamultiphasestructure,includingthe(La,Mg)Ni3phase,theLaNi5phaseandtheLaNi2phase.Therapidquenchingandelementsubstitutionhaveanimperceptibleinfluenceonthephasecompositionsofthealloys,butbothchangethephaseabundanceofthealloys.Therapidquenchingsignificantlyimprovesthecompositionhomogeneityofthealloysandmarkedlydecreasesthegrainsizeofthealloys.TheCusubstitutionpromotestheformationofanamorphousphaseintheas-quenchedalloy,andareversalresultbytheAlsubstitution.Theelectrochemicalmeasurementindicatesthattheelementsubstitutiondecreasesthedischargecapacityofthealloys,whereasitobviouslyimprovesthecyclestabilityofthealloys.ThepositiveinfluenceofelementsubstitutiononthecyclelifeofthealloysisinsequenceAl＞Cu＞Mn,andnegativeinfluenceonthedischargecapacityisinsequenceAl＞Mn＞Cu.Therapidquenchingsignificantlyenhancesthecyclestabilityofthealloys,butitleadstoadifferentextentdecreaseofthedischargecapacityofthealloys.

简介：通过对大型模具项目从开发到交付验收整个过程的介绍,展现现代化模具项目多元化管理的思路和优势,进而去思考未来项目管理发展的方向。

简介：Basedonclustervariationmethod(CVM)andnaturaliterationmethod(NIM),order-disorderphasetransitionintheintercalationcompoundsM1/2TiS2issimulatedbycomputer.Thefavorableconditions,underwhich3a0×a0superstructureisformed,aregiven,andtheresultsareingoodagreementwiththeexperimentsandtheoreticalcalculations.TherelationshipbetweencriticaltemperatureandM-ion-vacancyinteractionparameterislinear.

简介：进行了S90RG、S90RG1后桥半壳体的成形工艺过程的解析,介绍了排样下料方法的灵活运用,叙述了模具间隙的选取、回弹的补偿以及模具结构的合理设计.

简介：晶体结构和加氢行为(La_(1-x)Mg_x)_3Al(x=0.1，0.2，0.3，和0.4)合金被调查。这被发现有x=的合金0.1La和第0.2consi(Mg，艾尔)，La，和一个新奇阶段。新奇阶段作为La_2Al被决定。当Mg满足增加，La_2Al的数量减少，这被显示出。当x增加到0.3时，onlyLa(Mg，艾尔)并且La_2Al的小数量存在。当x是0.4时，La_2Al阶段消失，合金包含两La(Mg，艾尔)并且La(艾尔，Mg)_2洗阶段。(La_(0.9)Mg_(0.1))_3Al并且(La_(0.7)Mg_(0.3))_3Al合金能被氢的吸收在473K分解成LaH_3，MgH_2，和La_2Al_5。

简介：PolycrystallinesamplesofLa12x(Sr12yAgy)xMnO3(y=0.0,0.2,0.4,0.6,1.0)werepreparedbythesolid-statereactionmethod.ThetemperaturestabilityofmagnetoresistanceandmagnetoresistanceenhancementinLa1-x(Sr1-yAgy)xMnO3systemwithbothunivalentandbivalentelementsdopedatAsiteandwithunchangedvalueofMn3+/Mn4+ratiowereexploredthroughthemeasurementsofX-raydiffractionpatterns,magnetiza-tion-temperature(M-T)curves,resistivity-temperature(q-T)curvesandmagnetoresistance-temperature(MR-T)curves.Theresultsareasfollows:therearetwopeaksintheq-TcurvesofthesampleswithAgdoping,oneiscausedbyresistancechangeduringtheparamagnetism-ferromagnetismtransition,andtheotherisfromboundary-dependentscatteringofconductionelectronsontheboundariesofgrains.ThepeakvalueofMRincreaseswithincreasingAgdopingcontent,anditincreasesfrom8.2%fory=0.2to29.6%fory=1.0underthemagneticfieldofB=0.8T;MRremainsaconstantof12%inthetemperaturerangeof218-168Kforthesamplewithy=1.0,andthetemperaturestabilityofMRisinfavorofthepracticalapplicationofMR.

简介：采用扫描电镜、能谱仪以及X射线衍射仪对具有WC＋β（β为钴基粘结相）两相结构的WC-11Co-0.71Cr3C2-0.06RE（RE为含La、Ce、Pr、Nd的混合稀土）硬质合金烧结体表面进行观察与分析。结果表明，在烧结过程中合金中的La、Ce、Pr、Nd通过定向迁移与烧结炉内气氛中的S、O等杂质元素结合，在合金烧结体表面形成RE2S3（主）和RE2O2S（少量）弥散相。从合金中Cr3C2的热力学稳定性、Cr在Co中的溶解度特性以及稀土原子激发等3个方面，对稀土迁移活性的激发机制和稀土原子的定向迁移机制进行分析与讨论。

简介：招金矿业股份有限公司河东金矿坚持走科技探矿之路，不断加大探矿增储和矿产资源综合开发利用的科技投入力度，《杨家-白石夼地区金矿地球物理找矿研究》和《山东招远河东金矿成矿系统研究及找矿预测》两个探矿科研项目，取得了理想的探矿效果，1—3季度探矿新增金属量1532公斤，不仅实现了储量平衡，延长了矿山服务年限，而且为实现规模经营、保证矿山可持续发展奠定了坚实的基础。

简介：FluorescenceandcofluorescencepropertiesofTb(Ⅲ)solidcomplexeswerestudiedusingpyromelliticacid(PMA)asligandandfluorescenceinertionsasdopingelements.Thecofluorescenceenhancement,aresultofligandsensitizedfluorescence,wasobservedinTb(Ⅲ)solidcomplexesdopedwithfluorescentinertionsLa(Ⅲ),Gd(Ⅲ),Ca(Ⅲ),andSr(Ⅲ).Theeffectofthetypeandcontentofdopingelementsonfluorescenceenhancementwasstudied,andoptimumconditionsweredetermined.TheresultsshowthatGd(La,Ca,Sr)hasclearcofluorescenceeffectinsolidcomplexTb-M-PMAsystem,andinpresentwork,rareearthcomplexfluorescentpowderthatemitsbrightgreenfluorescenceatultravioletexcitationwasobtained,whichhadpotentialapplicationasfluorescentanti-counterfeitink.

简介：Thecorrosionfatiguebehaviorofepoxy-coatedMg–3Al–1Znalloywasinvestigatedinairand3.5wt%NaClsolution.Epoxycoatingasanewmethodwasusedtoimprovethecorrosionfatiguepropertyofthematerial.Resultsshowthatthefatiguelimit(FL)ofthecoatedspecimensishigherthanthatoftheuncoatedspecimensin3.5wt%NaClsolutionbecauseofthestrengtheningandblockingfunctionsoftheepoxycoating.TheFLofthecoatedspecimensin3.5wt%NaClsolutionisashighasthatinair.Itimpliesthatthecoatedspecimensarenotassensitivetotheenvironmentasthemagnesiumalloy.Thelowtensilestrengthandtheshortelongationofthepureepoxycoatingleadtothatthefatiguecrackofthecoatedspecimenisalwaysinitiatedfromtheepoxy-coatingfilmPoresandpinholesacceleratethefatiguecrackinitiationprocess.PinholesarecausedbythecorrosionreactionsbetweentheepoxycoatingandtheNaClsolution.

简介：前言3D打印技术，又称增材制造技术，以前称快速成型“快速成形”技术，出现在上世纪80年代中后期。世界上（包括国内）的第一次研究开发热度期，在上世纪80年代中后期至2003年左右。2003年至2012年出现了研究开发的低谷，其原因是多方面的。自从2012年开始，该技术的研究开发及应用又有了新的转机，其原因众所周知，因此，自2012年以来，3D打印技术出现了新一轮的研究开发热度期，并且，其热度远远大于第一次的热度。

简介：1．价格走势分析1．1国际铂价受日本地震影响大幅下跌2010年，由于需求改善，铂价震荡上行，年末上涨至1750美元／盎司。2011年初，铂价承接去年的上涨趋势，1月中旬在投资者推动下上涨至1800美元／盎司，随后铂价出现小幅回调。2月初，受南非供应吃紧影响铂再次发力，快速突破1850美元阻力，2月9日最高达到1864．5美元／盎司。

简介：针对激光直接沉积修复的1Cr15Ni4Mo3N钢零件在磁粉检测时出现的磁痕现象,采用接触通电、湿磁粉连续法,对设计的试样进行磁粉检测,确定磁痕显示位置;利用光学显微镜对磁痕显示处形貌及修复接头和组织进行观察和研究,分析磁痕的性质和形成原因。研究发现:激光直接沉积修复1Cr15Ni4Mo3N钢在磁粉检测过程中与修复区外轮廓完全重合的磁痕显示是伪磁痕显示,主要是由修复区与基体中奥氏体含量的差异造成的。

简介：ThermodynamicmodelsofcalculatingmassactionconcentrationsforstructuralunitsorioncouplesinRbCl-H2ObinaryandRbCl-RbNO3-H2Oternarystrongelectrolyteaqueoussolutionsweredevelopedbasedontheionandmoleculecoexistencetheoryat298.15K.Atransformationcoefficientisneededtocomparethecalculatedmassactionconcentrationandthereportedactivitybecausetheyareobtainedatdifferentstandardstatesandconcentrationunits.TheresultsshowthatthetransformationcoefficientsbetweenthecalculatedmassactionconcentrationsandthereportedactivitiesofthesamestructuralunitsorioncouplesinRbCl-H2ObinaryandRbCl-RbNO3-H2Oternarystrongelectrolyteaqueoussolutionschangeinaverynarrowrange.ThetransformedmassactionconcentrationsofstructuralunitsorioncouplesinRbCl-H2Obinarysystemareingoodagreementwiththereportedactivities.ThetransformedmassactionconcentrationsofRbClandRbNO3inRbCl-RbNO3-H2Oternarysolutionarealsoingoodagreementwiththereportedactivities,aRbCland3RbNOa,withdifferenttotalionicstrengthsas0.01,0.05,0.1,0.5,1.0,1.5,2.0,3.0and3.5mol/kg,respectively.AllthoseresultsmeanthedevelopedthermodynamicmodelofstrongelectrolyteaqueoussolutionscanreflectstructuralcharacteristicsofRbCl-H2ObinaryandRbCl-RbNO3-H2Oternarystrongelectrolyteaqueoussolutionsandthemassactionconcentrationalsostrictlyfollowsthemassactionlaw.

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简介：1Cr15Ni4Mo3N沉淀硬化不锈钢螺栓零件在制造工序磁粉检测时，发现螺栓表面有一条疑似裂纹状线性磁痕显示，后采用荧光渗透检测方法进行辅助检测，原磁痕显示处未见异常荧光显示。结合金相试验分析发现，螺栓原材料内呈带状分布的残余奥氏体，破坏了基体组织和材料磁性的连续性导致出现磁痕显示。研究为该材料在零件制造中磁粉检测的磁痕判定提供了依据。